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Yanmar 4JH DTE

Hi,

I have a yanmar 4jh dte and the problem is that when you in give it throttle there is a delay in RPM, sometimes up to 10 secs or more, the problem is worse when it is in gear. This problem has been going on daily for many years. The engine runs normally once the RPM is up. Does anyone have any idea what could be causing this?